Struct DomStringMapMut 

pub struct DomStringMapMut<'a, Ext: 'static> { /* private fields */ }

Write-side view of el.dataset. Borrows the element via NodeMut; mutations route through set_attribute / remove_attribute so the existing attribute-change mutation observer fires.

Implementations

impl<'a, Ext: 'static> DomStringMapMut<'a, Ext>

pub fn new(node: NodeMut<'a, Ext>) -> Self

Construct from a borrowed NodeMut. Used by NodeMut::dataset_mut() (M4b step 19) and tests.

pub fn set(&mut self, key: &str, value: &str) -> Result<()>

Set the data-* attribute corresponding to key. Errors only when the underlying node isn’t an element. DOM el.dataset[key] = value.

pub fn remove(&mut self, key: &str) -> Result<bool>

Remove the data-* attribute corresponding to key. Returns true iff the attribute was present (and is now gone). DOM delete el.dataset[key].